30 citations · 91 across the 25 of their papers we have counts for
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math.SP2014
On Factorizations of Analytic Operator-Valued Functions and Eigenvalue Multiplicity Questions
Fritz Gesztesy, Helge Holden, Roger Nichols
We study several natural multiplicity questions that arise in the context of the Birman-Schwinger principle applied to non-self-adjoint operators. In particular, we re-prove (and e…
math.SP2014
Inverse Spectral Problems for Schrödinger-Type Operators with Distributional Matrix-Valued Potentials
Jonathan Eckhardt, Fritz Gesztesy, Roger Nichols +2
The principal purpose of this note is to provide a reconstruction procedure for distributional matrix-valued potential coefficients of Schrödinger-type operators on a half-line fro…
math.SP2014
Principal Solutions Revisited
Stephen Clark, Fritz Gesztesy, Roger Nichols
The main objective of this paper is to identify principal solutions associated with Sturm-Liouville operators on arbitrary open intervals , as introduce…